From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 70F4F3F927B for ; Fri, 9 Oct 2026 05:56:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791525393; cv=none; b=EW0e+9JlKhldp8cCPQ8JhhGwQAJPkLw5u0jTJIRqQwi/Is3jnUOFLG6PrWP3LhH1uNrLmMOWay2q03BdGe5KYPvoYxjaoeUBks7z4M87jfYkyY4Pjp/HzcPw2IzOrnDVapcoQVOdunA4ly4dAIos35KDDLakA3pWgg0pPWMObYY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791525393; c=relaxed/simple; bh=EIrOfjzZ1MenHy9m+qajvRi7BlrG2Gkpr0eZj7nwskg=; h=Date:To:From:Subject:Message-Id; b=A+eFIdTgPU1lDapwAP2c+JeU68+JLJSFI64qol6PtmAJpueCO7zUgBDbIfVE7jbV7D7LHuZ8pO0YueCY8fhhRrTi7Mg1rc3k9aYi3OYR3kiNc269BnFlkF47SVJSlkKgJ7sAl8ilAPVpyXbryyWX0xVdyZpk7QLbn1OJlcCguoY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=xaM1osaQ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="xaM1osaQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 47AF11F000FF; Fri, 9 Oct 2026 05:56:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1791525392; bh=8wpD7Q5ub1HdQWaxYDGmgoFPXSRbiXP2cHNQTVqpc/0=; h=Date:To:From:Subject; b=xaM1osaQZ9Z8lEO7RKMFRxzuBY5XVBPwwciycPI92PJfWb7sBOS9d0SAz3NpV4T8X 7ipBqYIugVV9TrOhaRVdtgwvaU9esxpsQ3D8wH0boJGNjhBn+T55DqTZpUpSIPPjj4 cbLIn9QJam35V29L/b/8BaMpOkctQNXUIpUsKbfw= Date: Thu, 08 Oct 2026 22:56:31 -0700 To: mm-commits@vger.kernel.org,sj@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-damon-core-set-ctx-call_controls_obsolete-in-damon_new_ctx.patch removed from -mm tree Message-Id: <20261009055632.47AF11F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/damon/core: set ctx->call_controls_obsolete in damon_new_ctx() has been removed from the -mm tree. Its filename was mm-damon-core-set-ctx-call_controls_obsolete-in-damon_new_ctx.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: SJ Park Subject: mm/damon/core: set ctx->call_controls_obsolete in damon_new_ctx() Date: Wed, 2 Sep 2026 18:03:31 -0700 damon_ctx->call_controls_obsolete is used to disallow damon_call() requests when the request cannot be served. The field is unset and set when the context execution is started and terminated, respectively. The intention is to allow damon_call() requests only while the context is actively being executed. damon_ctx constructor, damon_new_ctx() unsets the field, though. As a result, passing the damon_ctx parameter that never successfully damon_start()-ed to damon_call() can indefinitely hang. The callers should ensure to avoid the case. Such parameter validation is not always simple. Actually such bugs in DAMON_RECLAIM and DAMON_LRU_SORT have been found and fixed [1]. Set the field in damon_new_ctx(), so that DAMON API callers can pass the context parameter to damon_call() without the additional check. Link: https://lore.kernel.org/20260903010334.93622-3-sj@kernel.org Link: https://lore.kernel.org/20260803134646.16640-1-sj@kernel.org [1] Signed-off-by: SJ Park Signed-off-by: Andrew Morton --- mm/damon/core.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) --- a/mm/damon/core.c~mm-damon-core-set-ctx-call_controls_obsolete-in-damon_new_ctx +++ a/mm/damon/core.c @@ -933,6 +933,7 @@ struct damon_ctx *damon_new_ctx(void) INIT_LIST_HEAD(&ctx->adaptive_targets); INIT_LIST_HEAD(&ctx->schemes); + ctx->call_controls_obsolete = true; prandom_seed_state(&ctx->rnd_state, get_random_u64()); return ctx; @@ -2206,10 +2207,6 @@ int damon_kdamond_pid(struct damon_ctx * * synchronization. The return value of the function will be saved in * &damon_call_control->return_code. * - * Note that this function should be called only after damon_start() with the - * @ctx has succeeded. Otherwise, this function could fall into an indefinite - * wait. - * * When this function is failed, the @ctx is guaranteed to be stopped. * * Return: 0 on success, negative error code otherwise. _ Patches currently in -mm which might be from sj@kernel.org are mm-damon-sysfs-schemes-read-sysfs_filter-addr_range-only-once.patch mm-damon-sysfs-schemes-read-sysfs_filter-sz_range-only-once.patch mm-damon-core-return-an-error-from-damos_commit_filter_arg.patch mm-damon-core-disallow-max-min-damos-filter-range-arguments-commit.patch mm-damon-sysfs-schemes-drop-centralized-filter-range-arg-validations.patch mm-damon-sysfs-schemes-use-switch-case-in-add_scheme_filters.patch mm-damon-core-kunit-extend-damos_commit_filter_for-for-wrong-input.patch mm-damon-core-kunit-test-invalid-damos-filter-commits.patch mm-damon-api-introduce-damon_filter_type_hugepage_size.patch mm-damon-core-commit-hugepage_size-type-damon-filter.patch mm-damon-ops-common-support-hugepage_size-damon-filter-matching.patch mm-damon-sysfs-add-minmax-files-under-probe-filter-directory.patch mm-damon-sysfs-support-hugepage_size-probe-filter.patch docs-mm-damon-design-update-for-hugepage_size-probe-filter.patch docs-admin-guide-mm-damon-usage-update-for-hugepage_size.patch docs-abi-damon-update-for-hugepage_size-probe-filter.patch mm-damon-api-remove-nr_damos_filter_types.patch mm-damon-core-use-abs_diff-in-damon_feed_loop_next_input.patch mm-damon-core-use-mult_frac-in-damon_feed_loop_next_input.patch mm-damon-core-set-damon_ctx-walk_control_obsolete-in-damon_new_ctx.patch mm-damon-core-document-damon_call-damon_start-race-hang-issue.patch mm-damon-paddr-remove-pa-parameter-from-damon_pa_filter_pass.patch mm-damon-tests-core-kunit-test-eligible_mem_bp-commitment.patch mm-damon-tests-core-kunit-add-probe_hits_wsum-damos-filter-commit-test.patch selftests-damon-sysfs_memcg_path_leak-fail-only-for-real-damon-leak.patch docs-mm-damon-design-clarify-bp-is-basis-point.patch mm-damon-core-introduce-damos_quota_goal-complement.patch mm-damon-core-add-complement-argument-to-damos_new_quota_goal.patch mm-damon-sysfs-schemes-support-quota-goal-complement-flag.patch mm-damon-tests-core-kunit-test-quota_goal-complement-commit.patch selftests-damon-sysfssh-test-quota-goal-complement-flag-file.patch docs-mm-damon-design-document-damos-quota-goal-complement-flag.patch docs-admin-guide-mm-damon-usage-update-for-quota-goal-complement-file.patch docs-abi-damon-update-for-quota-goal-metric-complement-sysfs-file.patch